package org.smart4j.chapter02.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public final class PropsUtil {
    private  static  final Logger LOGGER=  LoggerFactory.getLogger(PropsUtil.class);
    public static Properties loadProps(String fileName){
        Properties props=null;
        InputStream is=null;
        try {
            is=Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);
            if(is==null){
                throw new FileNotFoundException(fileName+"file is not found");
            }
            props=new Properties();
            props.load(is);
        }catch (IOException e){
            LOGGER.error("load properties file failure");
        }finally {
            {
                if (is!=null){
                    try {
                        is.close();
                    }catch (IOException e){
                        LOGGER.error("close input stream failure");
                    }
                }
            }
        }
        return props;
    }
    //获取字符型属性(默认值为空字符串)
    public  static  String getString(Properties props,String key){
        return  getString(props,key,"");
    }
    //获取字符型属性(可指定默认值)
    public  static  String getString(Properties props,String key,String defaultValue){
     String value=defaultValue;
     if (props.containsKey(key)){
         value=props.getProperty(key);
     }
        return  value;
    }
    //获取数值型属性（默认值为0）
    public  static  int getInt(Properties props,String key){
        return  getInt(props,key,0);
    }
    //获取数值型属性(可指定默认值)
    public  static  int getInt(Properties props,String key,int defaultValue){
        int value=defaultValue;
        if (props.containsKey(key)){
           value=CastUtil.castInt(props.getProperty(key));
        }
        return  value;
    }
    //获取布尔型属性(默认值为false)
    public  static  boolean getBoolean(Properties props,String key){
        return  getBoolean(props,key,false);
    }
    //获取布尔型属性(可指定默认值)
    public  static  boolean getBoolean(Properties props,String key,Boolean defaultValue){
        boolean value=defaultValue;
        if(props.containsKey(key)){
            value=CastUtil.castBoolean(props.getProperty(key));
        }
        return  value;
    }
}
